2012CBET.3143....2M

G. H. Marion and D. Milisavljevic, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrogram (range 340-740 nm) of PSN J15315765+6814428 = 2012cs was obtained on June 14 UT by K. Rines and S. Wilhelmy with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2012cs is a type-IIb supernova about two weeks after maximum light. The H-alpha feature is very broad with a velocity at the absoprtion minimum of 13900 km/s. A good fit is found to the template of SN 2003bg at 12 days post-maximum.